Investigation of the Independent Photo-Voltaic LED Illuminated System

• Main Authors: Chia-Hao Hsu, 許家豪
• Other Authors: Shi-Li Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/87813689376121563016

碩士 === 國立臺灣大學 === 機械工程學研究所 === 95 === 　　As the better human civilization developed, the much dependence on resource of energy increased. The progression of present economic is completely in accordance to the utilities of energies and advance of technologies. In the recent years, the deficiency of energy and appearance of eco-awareness fasten the researches for renewable energy. Using solar cell to generate electricity and combining with LED which is characterized by saving energy to be an independent Illuminated System, which could not only support self-sufficient power and lower maintenance costs but also extend the time of night lighting. 　　The first part of this research is the long-term experiment in an independent Photo-Voltaic LED illuminated System. The author dedicates to improve the efficiency and stability of the system experimentally. The results of the long-term test are evaluated. Besides, the weather effects on charging efficiency are also presented. In order to promote the charging efficiency of system, this study proposes some reform methods recommended. The system should employ high powered LED to achieve high luminance. Thus, the requirement of cooling will be raised as well. Therefore, the second part of this research is based on theoretical analysis to evaluate the influences of heat sink geometrical parameter on the thermal capacity. This study presents a set of geometrical parameters which could achieve a lower 0.1oC/W of heat sink resistance at 256W than the original design.